The notice described USDA officials finding live cockroaches at a sink employees use to wash their hands, directly across from an inspection station. At the same time officials made the observation, "slaughter operations were in progress, and exposed product was present on the kill floor," the notice read.

The notice listed cockroaches having been found at a handwashing sink, a production tub, near a sanitizer dispenser box and on the floor.

Foster Farms released a statement to NBC4 in response confirming the temporary closure.

"This morning, a cockroach was observed during plant operations at the company’s Livingston, Calif., plant and the company was notified of four similar incidents since September 2013 in FSIS correspondence today," the Foster Farms statement read. "Foster Farms closed the Livingston facility immediately for sanitization and treatment."

"No other facilities are affected. No products are affected. Product production has been transferred to the company’s other facilities," the statement read.

The poultry processor maintained in its statement that inspectors found five cockroaches in the 250,000 square-foot building since September, adding that "a single incident is not acceptable."

Last year's salmonella outbreak appeared to have begun in March, and the USDA was notified of the illnesses in July, according to the FSIS.

The U.S. Department of Agriculture had issued a health warning for the chicken but did not issue a recall. A spokesman for Foster Farms said the infections were caused by eating undercooked or improperly handled chicken.